2026-04-17T10:36:12Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1754142025-12-05T14:09:32Zcom_2072_1057col_2072_478815col_2072_478917

00925njm 22002777a 4500 dc Curutchet Barat, Carles E. author Voityuk, Alexander A. author 2021-03-19T10:49:59Z 2021-03-19T10:49:59Z 2012-10-25 2021-03-19T10:49:59Z The possibility to optimize optoelectronic devices, such as organic light-emitting diodes or solar cells, by exploiting the special characteristics of triplet electronic states and their migration ability is attracting increased attention. In this study, we analyze how an intervening solvent modifies the distance dependence of triplet electronic energy transfer (TEET) processes by combining molecular dynamics simulations with quantum chemical calculations of the transfer matrix elements using the Fragment Excitation Difference (FED) method. We determine the β parameter characterizing the exponential distance decay of TEET rates in a stacked perylene dimer in water, chloroform, and benzene solutions. Our results indicate that the solvent dependence of β (βvacuum = 5.14 Å-1 > βwater = 3.77 Å-1 > βchloroform = 3.61 Å-1 > βbenzene = 3.44 Å-1) can be rationalized adopting the McConnell model of superexchange, where smaller triplet energy differences between the donor and the solvent lead to smaller β constants. We also estimate the decay of hole transfer (HT) and excess electron transfer (EET) processes in the system using the Fragment Charge Difference (FCD) method and find that βTEET can be reasonably well approximated by the sum of βEET and βHT constants. Dinàmica molecular Transferència d'energia Dissolvents Química quàntica Molecular dynamics Energy transfer Solvents Quantum chemistry Distance dependence of triplet energy transfer in water and organic solvents: A QM/MD study